Rename to posterdown.ids

and drop support for other layouts

Change-Id: I8f62e38044f5259bd91bcc5aac551c9d9567d5b2
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index d55e8f1..69364f3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -52,11 +52,11 @@
     - end_section install_r_packages
 
   script:
-    - start_section installing "Installing posterdown (ids)"
+    - start_section installing "Installing posterdown.ids"
     - R -e 'devtools::install()'
     - end_section installing
     - start_section render "Generating demo artifacts"
-    - R_CACHE_ROOTPATH=./cache R -e "require(rmarkdown); render('inst/rmarkdown/templates/posterdown_ids/skeleton/skeleton.Rmd', output_format='posterdown::posterdown_ids', output_dir='target')"
+    - R_CACHE_ROOTPATH=./cache R -e "require(rmarkdown); render('inst/rmarkdown/templates/posterdown_ids/skeleton/skeleton.Rmd', output_format='posterdown.ids::posterdown_ids', output_dir='target')"
     - ./ci/html2pdf target/skeleton.html target/skeleton.pdf 1
     - inkscape -b white --pdf-poppler -o target/skeleton.svg target/skeleton.pdf || true
     - scour -i target/skeleton.svg -o target/skeleton_optimized.svg --enable-viewboxing --enable-id-stripping --shorten-ids --indent=none